I put a scope on the HV during one of those events, many years ago, and I recall that instead of a steady current, it was a sawtooth, so I am not sure if the OBDIIC&C current is the peak or average when that is happening?
I expect the pack PTC strips and the temperature sensors keep things from getting too hot, and from what I have seen, the temperature issues are the main reason that overcharging at higher currents are a problem.
Most NIMH and NICAD chargers for power tools charge at several amps until the temperature raises to a setpoint, and then just stop.
A look at these Prius subpacks
and one would have expected them to be toast, but I have been using that same set of two subpacks as my lawn tractor 12V battery for several years, and they work great.
Sit all winter, one grid charge in the spring, and a summer of use. My lawn is big, so when using the bagger I need to stop to empty the bags and restart the lawn tractor 20-30 times in an hour mowing, and the batteries crank the 13HP engine as well on the last start as on the first.
Tough little batteries.